Well it's been about 4 months since I won the adapter and M601 attys. I haven't even tried the sleeved atty yet. The regular M601 atty has been my regular daily
vape on my eGo, and after all this time it still blows clouds of vapour and tastes great. I almost don't want to jinx it by writing this! I can't remember the last time I used a 510 atty and I have at least a half dozen still in the wrapping. I love this atty!